6.5.1

Table Of Contents
The initial boot file, pxelinux.0 or gpxelinux.0, tries to load a PXE configuration file in the following
order:
1 It tries with the MAC address of the target ESXi host, prefixed with its ARP type code, which is 01 for
Ethernet.
2 If that attempt fails, it tries with the hexadecimal notation of target ESXi system IP address.
3 Ultimately, it tries to load a file named default.
File Location for the PXE Configuration File
Save the file in /tftpboot/pxelinux.cfg/ on the TFTP server.
For example, you might save the file on the TFTP server at /tftpboot/pxelinux.cfg/01-00-21-5a-
ce-40-f6. The MAC address of the network adapter on the target ESXi host is 00-21-5a-ce-40-f6.
PXE Boot Background Information
Understanding the PXE boot process can help you during troubleshooting.
TFTP Server
Trivial File Transfer Protocol (TFTP) is similar to the FTP service, and is typically used only for network
booting systems or loading firmware on network devices such as routers. TFTP is available on Linux and
Windows.
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Most Linux distributions include a copy of the tftp-hpa server. If you require a supported solution,
purchase a supported TFTP server from your vendor of choice. You can also acquire a TFTP server
from one of the packaged appliances on the VMware Marketplace.
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If your TFTP server will run on a Microsoft Windows host, use tftpd32 version 2.11 or later. See
http://tftpd32.jounin.net/.
SYSLINUX, PXELINUX, and gPXELINUX
If you are using PXE in a legacy BIOS environment, you need to understand the different boot
environments.
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SYSLINUX is an open source boot environment for machines that run legacy BIOS firmware. The
ESXi boot loader for BIOS systems, mbootc.32, runs as a SYSLINUX plugin. You can configure
SYSLINUX to boot from several types of media, including disk, ISO image, and network. You can find
the SYSLINUX package at http://www.kernel.org/pub/linux/utils/boot/syslinux/.
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PXELINUX is a SYSXLINUX configuration for booting from a TFTP server according to the PXE
standard. If you use PXELINUX to boot the ESXi installer, the pxelinux.0 binary file, mboot.c32,
the configuration file, the kernel, and other files are all transferred by TFTP.
vSphere Installation and Setup
VMware, Inc. 41